Played both sides, it isnt as you said. Alliance was not significant to the sethrak or vice versa.
To claim otherwise is to embrace delusion and you need to hold your facts to a higher standard then to embrace such false claims.
Hopefuls love to talk about the quest where you save vorrik and he gives you a run down of whats going on in voldun, but no one and I mean no one ever brings up the horde quests with the witches that starts abruptly and ends just as abruptly as the vorrik quest for alliance.
These quests arent supposed to be some holy grails of interaction, they are demo quests to coax you to play the other side so you can see the whole story.
They arent supposed to be taken with the utmost importance, there isnt a soul talking about horde and drust.
I dont care if you like sethrak, but stop trying to convince people a pebbles is worth thrice as much as a diamond.
There is no grand alliance sethrak scenario, they ended with horde and owe everything to the horde that liberated their people and saved their god.
Stop trying so hard to say their interactions are equal.
This isnt a nightbourne sitiuation, it doesnt even remotely touch the surface of being the same thing.